The Synchro,control Transformer, cataloged under National Stock Number 5990-00-138-9504, is classified within Federal Supply Class 5990 (Synchros and Resolvers) of the Electrical and Electronic Equipment Components group. The manufacturer of record is Kearfott Corp Div Kearfott Corporation. Government technical data includes 29 specifications, cited from the U.S. Government catalog. The record lists 1 manufacturer part number for this item, enabling identification through both NSN and commercial part number lookups. 4 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5990-00-138-9504 |
| Primary Part Number | CR90900012 |
| Item Name | Synchro,control Transformer |
| FSC / FSG | 5990 / 59 — Synchros and Resolvers |
| Manufacturer | Kearfott Corp Div Kearfott Corporation |
| Status | ACTIVE |
| Body Size | 11 |
| Shaft Type | ROUND FRONT SHAFT |
| Shaft Radial Play Test Point | 0.125 INCHES NOMINAL IN |
| Zrs Impedance Angle in Deg | 30.00 NOMINAL |
| Flange Diameter | 1.0620 INCHES NOMINAL IN |
| Undercut Width | 0.0500 INCHES NOMINAL IN |
| Shaft Diameter | 0.1195 INCHES MINIMUM AND 0.1200 INCHES MAXIMUM FRONT SHAFT IN |
| Rotor DC Resistance in Ohms | 450.00 NOMINAL |
| Length | 0.0620 INCHES NOMINAL SHOULDER IN |
| Body Style | STANDARD ROUND B |
| Shaft Radial Play Determining Weight | 4.0 OUNCES OZ |
| Zrs Impedance Magnitude in Ohms | 659.00 NOMINAL |
| Flange Thickness | 0.0930 INCHES NOMINAL IN |
| Stator Input Current Rating | 45.0 MILLIAMPERES NOMINAL |
| Zro Impedance Angle in Deg | 80.00 NOMINAL |
| Phase Shift Angle in Deg | 6.000 INPUT TO OUTPUT NOMINAL |
| Criticality Code Justification | FEAT |
| Mounting Surface to Terminal End Distance | 1.8350 INCHES MAXIMUM IN |
| Frequency in Hertz | 400.0 NOMINAL |
| Stator Input Electrical Power Rating | 75.0 MILLIWATTS NOMINAL |
| Terminal Location | REAR |
| Shaft End Play Determining Weight | 8.0 OUNCES OZ |
| Shaft Maximum Radial Play | 0.0008 INCHES IN |
| Schematic Diagram Designator | 1 Y-ROTOR, 1 STATOR |
| Zso Impedance Angle in Deg | 80.00 NOMINAL |
| Shaft Length | 0.5010 INCHES NOMINAL SINGLE SHAFT IN |
| Pilot Diameter | 0.6245 INCHES MINIMUM AND 0.6250 INCHES MAXIMUM IN |
| Zso Impedance Magnitude in Ohms | 577.00 NOMINAL |
| Maximum Fundamental Null Voltage in Millivolts Per Volt | 20.00 OUTPUT |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL Q — CCL Item — Commerce Control List |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | Y |
| Part Number | Manufacturer |
|---|---|
| CR90900012 | Kearfott Corp Div Kearfott Corporation (USA) |
| Reference | Meaning |
|---|---|
| 147-045-0001 | 1/2 Source control — Government-approved source U.S. Government activity |
| CR90900012 | 5/9 Secondary reference U.S. Government activity |
| 147-045-0001 | 3/2 Design control — primary reference U.S. Government activity |
| 147-045-0001 | 3/2 Design control — primary reference U.S. Government activity |
NSN 5990-00-138-9504 is a Synchro,control Transformer, manufactured by Kearfott Corp Div Kearfott Corporation, classified under FSC 5990, Synchros and Resolvers. Status: active.
NSN 5990-00-138-9504 has 1 manufacturer part number on file: CR90900012 (Kearfott Corp Div Kearfott Corporation).
Key specifications for CR90900012: Body Size: 11; Shaft Type: ROUND FRONT SHAFT; Shaft Radial Play Test Point: 0.125 INCHES NOMINAL IN; Zrs Impedance Angle in Deg: 30.00 NOMINAL. 29 specifications are documented in the U.S. Government catalog.
No hazard code in the DLA record (HMIC N). Hazard information on this page is shown exactly as it appears in the DLA record.
NSN 5990-00-138-9504 has DEMIL Code Q. Demilitarization may be required before disposal or transfer to non-military entities.
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-16.
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-18.